Table 3.
Mean PDD/DDD ratio by number of drugs and medication class
| Number of drugs in class | Number of regimensa(%) | Mean (SD) PDD/DDD ratio |
|---|---|---|
| Antidepressantsb | ||
| 1 | 204 (64) | 1.3 (1.1) |
| 2 | 97 (30) | 2.5 (1.6) |
| 3 | 15 (5) | 3.5 (2.0) |
| 4 | 3 (1) | 5.1 (1.5) |
| Benzodiazepinesc | ||
| 1 | 107 (80) | 0.6 (0.8) |
| 2 | 24 (18) | 1.4 (1.3) |
| 3 | 2 (2) | 4.0 (1.5) |
| Antipsychoticsd | ||
| 1 | 167 (77) | 0.7 (0.7) |
| 2 | 47 (22) | 2.2 (2.0) |
| 3 | 3 (1) | 7.4 (6.5) |
aSome patients took multiple regimens with different number of drugs within a medication class; b236 patients took antidepressants for 50% or more days; c111 patients took benzodiazepines for 50% or more days; d176 patients took antipsychotics for 50% or more days.